I haven't done a OBW, but I have done a Stack-n-Whack, which were popular in the late '90s, early 2000s. Your blocks are gorgeous and are perfect for a couple of the quilts in Bethany Reynold's Magic Stack-n-Whack Quilts pub. 1998. Like a couple of people said, you add triangles to the hexies and get a star effect. In fact the pattern is called Hexagon Star. She's got a couple of layouts including one with a border done with triangles of focus fabric and star fabric. I just checked Amazon and they have her book in stock for only $12.03. :-)